(3-Mercaptopropyl)triethoxysilane-Modified Reduced Graphene Oxide-Modified Polyurethane Yarn Enhanced by Epoxy/Thiol Reactions for Strain Sensors

Abstract

In the current work, a method was proposed to fabricate strain-sensing yarns via epoxy/thiol reactions by a dip-coating method. Reduced graphene oxide (rGO) was modified with (3-mercaptopropyl)­triethoxysilane, and polyurethane yarn was cross-linked with 3-glycidoxypropyltrimethoxysilane. The existence of thiol in modified rGO and epoxy in the cross-linked polyurethane yarn contributed to the formation of the covalent bond between the elastic substrate and the conductive layer, resulting in good adhesion between the substrate and the conductive layer, as well as excellent electromechanical performance. The outstanding strain-sensing performance make the prepared yarn show excellent potential in practical applications when monitoring human motions, which makes it a promising candidate for wearable sensing devices.

Lowering the curing shrinkage of epoxy acrylate‐based photosensitive resins through nano‐TiO2 particle with surface grafted by thiol‐terminated hyperbranched polymer

“…When the content of THBP@TiO 2 reached 7 wt%, the concentration of nanoparticles in the light‐cured 3D printing material was further increased, and the higher surface energy promoted its agglomeration. This agglomeration was usually considered as a defect in the polymer, which was easy to cause stress concentration and a decrease in the tensile strength of the material 31 …”

“…This agglomeration was usually considered as a defect in the polymer, which was easy to cause stress concentration and a decrease in the tensile strength of the material. 31 It can be seen from Figure 12 that as the content of THBP@TiO 2 was less than 5 wt%, the impact strength of the EA-based 3D printing materials increased gradually. As the content of THBP@TiO 2 was greater than 5 wt%, the impact strength of the EA-based 3D printing materials decreased.…”

Interfacial Click Chemistry Enabled Strong Adhesion toward Ultra‐Durable Crack‐Based Flexible Strain Sensors

“…Other interfacial chemistries in Figure S3a (Supporting Information), such as thiol/double bond click reaction and thiol/epoxy click reaction, have been well characterized, which are helpful for improving the interfacial adhesion. [31,32] Also, in addition to silane treatment of substrate, we also provided three surface modification methods including surface primer, polydopamine (PDA)-coating, and surface initiation to expand the universality of the strategy (Figure S3b, Supporting Information). Taking PDMS as an example, the surface primer method can cure the PDMS precursor with active functional groups (such as amino group, sulfhydryl group, and double bond) on the substrate in situ to obtain the surface with active functional groups.…”

“…The corresponding chemical reaction equations between different multifunctional polymers and substrate are shown in Figure S3 (Supporting Information). [27,32,34,35]…”

A Review of Electro Conductive Textiles Utilizing the Dip-Coating Technique: Their Functionality, Durability and Sustainability

“…As can be seen in Table 3 , numerous electro conductive textiles were recently fabricated by dip-coating and applying G and its derivates, namely: nylon fabric [ 37 , 38 , 39 ], Spandex yarn [ 36 , 40 ], cotton fabric/yarn [ 38 , 41 , 42 ] ( Figure 3 ), wool fabric [ 43 ], polyurethane yarn [ 44 ], etc. As reported by [ 40 ], conductivity increases exponentially with the dipping cycles due to the enlarged thickness of the deposited layers.…”